Windows continous integration

[DerThorsten]

setup continuous integration on windows with appveyor https://www.appveyor.com/

This build should use conda to fetch dependencies.

[DerThorsten]

@bluescarni If you could help here to set this up this would be great =)

[bluescarni]

PR is up at #83. I guess you'll have to enable the project in the appveyor config page, if you haven't already.

[bluescarni]

I enabled appveyor on my fork to test it, build is passing:

https://ci.appveyor.com/project/bluescarni/nifty/build/1.0.2

Python is not enabled yet as I am running into undefined symbol errors in conjunction with HDF5.

[DerThorsten]

Thank you very much.

Maybe some linking issues for HDF5? Greetings Thorsten

[bluescarni]

@DerThorsten actually there's more issues when enabling the python bindings on MSVC. In addition to the HDF5 linking issue:

1. for whatever reason, the usage of size_t instead of std::size_t trips up the compilation of the python bindings (but strangely enough, it's ok in the C++ tests - maybe it has something to do with the fact that pure C headers are being included when compiling the python bindings).
2. there's a bunch of scary errors when enabling the LP_MP option in the bindings, including an internal compiler error apparently. I am not familiar with the code, and I cannot really tell if it's a genuine coding error or if it is just MSVC being a shitty compiler.

I have fixed all the occurrences of 1) I could identify, which involved also some modifications to marray/graph I believe. I'll open a PR shortly with a link to the appveyor log.

[bluescarni]

PR is up at #85.

[DerThorsten]

Yay seems like it builds with python. I'll set up the integration of the python unit tests.

Thank you again.